looking at the source code, on the details page:
<div id="details-sale-price" style="display: block;"> Sale Price: $<span id="ProductSalePrice">7.19</span></div>
there is:
#details-sale-price
and:
#ProductSalePrice
on the results page, the code for the sale price:
<span class="results-sale-price">Sale Price: $7.19 - $10.99</span>
so the selector would be:
.results-sale-price
and on the home page the code for the sale price is:
<div id="sale-featured-price">
Sale Price: $7.19 </div>
so use the following selector:
#sale-featured-price